Liquid crystal display screen defect automatic detection device

The invention discloses an automatic defect detection device for a liquid crystal display screen. The automatic defect detection device comprises a mounting frame, a detection box, an inner wall fixedly arranged on the mounting frame, a detection device main body, a conveying device, an objective table, a fixing mechanism and a detection device, wherein the detection device main body is mounted on one side of the inner wall of the detection box; the conveying device is mounted at the bottom of the inner wall of the mounting frame; according to the automatic detection device for the defects of the liquid crystal display screen, the driving component drives the movable plate to move in the sliding component, so that the two fixed plates are close to each other, and the liquid crystal display screen is clamped and fixed, and the problems that in the conveying process of the liquid crystal display screen, the liquid crystal display screen cannot be stably placed on the objective table, and consequently the liquid